Characterization of Fluid-solid Coupling in Butt-welded Fuel Line Under Complex Flow Field
Aircraft fuel pipeline internal fluid flow characteristics are complex,the interaction between the oil and the pipe wall produces the fluid-solid coupling effect seriously affects the safety of the pipeline,in-depth study of the fluid-solid coupling characteristics of the pipeline to reduce vibration and wear of the pipeline is of great significance.The specific dimensions and mechanical parameters of the welded joint area are obtained through metallographic testing and microtensile testing,and the fluid-solid coupling model of the butt-welded fuel line with a 90° bend is established.Realizable k-ε turbulent flow model is adopted to carry out the study,and the effects of different inlet flow rates on the flow characteristics and the stress response law in the fluid domain and the response of the equivalent force in different regions are comprehensively analyzed under the constant velocity flow field and the results of the response of the equivalent force in different regions are also analyzed under the pulsating flow field.It is found that:under constant velocity flow field,the maximum equivalent force at the outlet bend section is significantly affected by the flow velocity;under pulsating flow field,the maximum equivalent force at the welded joint appears in the weld area and the stress level is more concentrated.This will provide an important reference for improving configuration design and system performance of aircraft fuel lines.
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